Current ver is 4.1.5 , I want to uninstall and reinstall v4.1.4 as code seems to be breaking while compiling and v4.1.4 may help as per the suggestions in this forum.
While running the above it says "up to date in 0.141s (sec keep changing)".

If truffle didn't appear in npm ls -g then it is not installed. Why do you believe it still is installed?
– IsmaelApr 18 '18 at 1:56

I had installed it, also its shows version and earlier when i compile other program with truffle it was working when i do truffle version it gives Truffle v4.1.5 (core: 4.1.5) Solidity v0.4.21 (solc-js)
– sv2011Apr 18 '18 at 2:33

Try running where truffle to determine where it is installed.
– IsmaelApr 18 '18 at 2:53